Sign Up to Receive Posts

Leave This Blank:Leave This Blank Too:Do Not Change This:

Your email:

Recent Comments

MYActually, just realized you're the author of Man and Impact in the Americas. I found out about your book while working on the bibliography, but couldnt find anywhere to read it. I can't include it...

E.P. Grondineuhh Steve -
Why do you think that Greenland has always been where it is now?
Do you think that Greenland was always covered in ice?
I suppose you can look forward to leaving sunny Mexico,...

manifesto2000I've just finished reading Wally's 2013 article: "Does air capture constitute a viable backstop against a bad CO2 trip?" and I'd like to ask him if he has thought more about CO2 as a necessary...

SteveGinGTOGeorge, are you open for adding articles to this list? Or would a separate list be under consideration?
If so, I ran across the WattsUpWithThat post of March 12, 2013, entitled, "New evidence...

At the end of the Pleistocene a Younger Dryas “black mat” was deposited on top of the Pleistocene sediments in many parts of North America. A study of the magnetic fraction (~ 10,900 ± 50 B.P.) from the basal section of the black mat at Murray Springs, AZ revealed the presence of amorphous iron oxide framboids in a glassy iron-silica matrix. These framboids are very similar in appearance and chemistry to those reported from several types of carbonaceous chondrites. The glass contains iron, silicon, oxygen, vanadium and minor titanium, while the framboidal particles contain calcium as well. The major element chemistry of both the spherules and the glass matrix are consistent with the chemistry of material associated with meteorite impact sites and meteorites. Electron microscopy confirms that the glassy material is indeed amorphous, and also shows that what appear to be individual oxide particles are amorphous as well. The latter appears consistent with their overall morphology that, while euhedral, typically shows significant fracture. Based on these data, we argue that these particles are the product of a hypervelocity impact. âº A Younger Dryas “black mat” was deposited on Pleistocene sediments. âº The magnetic fraction at Murray Springs revealed the presence of iron oxide framboids. âº The framboid particles are similar to those reported from carbonaceous chondrites. âº The particles are not consistent with known cosmic dust or terrestrial materials.